Who invented the sea plane?

First practical Hydroplane ( do not confuse with motorboat of same name) was designed by Glenn Curtiss, well-known aircraft pioneer. Curtiss also favored an unusual type of mid-wing ( say on biplanes) ailerons which were officially referred to as Interplane Field Struts. Bow-on, they gave the Biplane the appearance of a Triplane. these are control surfaces-- not actual wings. This set-up did not survive the tests of World War I and was not used after the War.